Date: Wed, 21 Jul 2021 14:07:33 +0200 From: Miroslav Lachman <000.fbsd@quip.cz> To: Andriy Gapon <avg@FreeBSD.org>, FreeBSD Stable Mailing List <freebsd-stable@freebsd.org> Subject: Re: CPU hot-plug and RAM hot-add in virtual machines Message-ID: <c647b6b8-f924-e697-bacd-a29f31ed9cae@quip.cz> In-Reply-To: <14d647fe-5bc3-b69e-e074-6202b2418d22@FreeBSD.org> References: <4336a1bf-d826-dba3-9ec1-9b48cf7cd177@quip.cz> <70033628-bc3a-24d2-4c65-9a3b9c1c66d5@FreeBSD.org> <b849f8d3-661e-f5c5-c5e6-594219dbd842@quip.cz> <14d647fe-5bc3-b69e-e074-6202b2418d22@FreeBSD.org>
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On 21/07/2021 12:45, Andriy Gapon wrote: > On 21/07/2021 11:53, Miroslav Lachman wrote: >> On 09/07/2021 13:16, Andriy Gapon wrote: [..] >> Thank you for your reply. I know nothing about system internals. Is it >> too much work to implement it or just nobody from developers need it >> thus nobody write the code? Virtualization is more and more popular >> these days so I think it will be useful for many users. > > In my opinion, both would be big changes. > At the moment we do not have any support for offlining / onlining CPUs > and that would involve a lot of careful changes like safely updating CPU > sets, various CPU masks, etc. > > Ditto for the memory. Updating page arrays, free memory accounting > structures, possibly some memory maps, etc. > > Definitely not a weekend project. Thank you again. It really seems too complicated. Miroslav Lachman
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